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District Heating and Cooling

Annex X Project 03

The Research / IEA DHC Annexes / 2011-2014 / Annex X / Annex X Project 03

Towards 4th Generation DH: Experiences with and Potential of Low Temperature DH

EU GHG emissions towards an 80% domestic reduction

Project Downloads

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Lead Country: Denmark

Fourth Generation District Heating (4GDH) implies very low temperature heating systems. The impact of such systems is to extend locally available sources of useful energy, including renewable and waste heat sources. The overall goal has been to bring experience, knowledge and solutions for Fourth Generation District Heating (4GDH) to a level where they are ready to be implemented widely.
The main objective of the project has been to analyse lessons learned from early examples of low temperature (50°-55°C) district heating schemes already serving new-build high-energy-performance buildings. Such lessons include how effective comfort levels have been maintained and how the legionella risk has been addressed. This has enabled the potential for replication, in-country and internationally.
The practicality of extending the scope of 4GDH to existing buildings by lowering the supply temperature of more conventional district heating systems has also been been examined.

Project contact

Hongwei Li, PhD

Technical University of Denmark (DTU)
Department of Civil Engineering Section of Building Physics and Services
Building 118, 
2800 Kgs. Lyngby,

Phone: +45 45 25 50 25

Email:  hong (at) byg.dtu.dk